Islam



f To all whom itmay concern:

PAT-Em Aacpr'i-f:ren.

1 fgyenonen lM.onl'ncrsianni@ on PROVIDENCE, RHODE ISLAND;V

` YiMPRmilan/[Elu l-Nu f-METELLIC PISTbN AND v'Lv-e-ROD vPACK-mes.

Be it `known `that I, GEORGE M. GRUICK- sHANK, of the city and county of Providence, `and State of Rhode Island, have invented a newand usefulA Improvement in Metallic Piston and Valve-Rod Packing.

My invention relates to that class of metallic packing which is formed of segmental blocks of metal fitted to encircle the rod, and which is actuated byl springs into a close contact therewith.

My invention consists in the novel construction and arrangement of these segments, 4by means of which their `wearing may not only be continuously [compensated, but, by the 'introduction ofspace-blocks, the entire packing may teuunzedwna r do `11m-,by declare that the following specification, taken in connection `with the` drawing furnished and forming a part of the same, is a true, clear,and exact description thereof.

Reference being had to the drawing, Figure c `l represents-a cylinder-head with my improved packing in position. vThe outer or face plate is removed. Fig. 2 representsthe packing with the case containing it removed from the cylinder-head. Fig. 3 represents one section or half of the packing,the several parts being ,separated for` the purpose of fully exhibiting their form and relativepositions. Fig. 4 represents the remaining section or half of the packing. Fig. .Ev-represents, in longitudinal vertical section, the cylinder-head and the case containing the packing, and the several partsin position. Fig. 6 represents one Asection of thepacking with space-blocks introduced.

,- The same letters of reference are used in all the iigures.

A represents the case, which contains the packing.

B, C, F, and Gr' are `the packing-segments,

' which come in contact with the circumierence of the rod. Each `ofthese has a width atrifle less than the diameter of the rod, and at their innerl ends they are recessed or turned out to correspond `with one-half of the circumference of the rod. .When placed in position the outside edges of `the packing should not come `quite in contact, and with lthat exception the two should `fully embrace the rod.

Specification forming part of Letters Patent No. 112,423, dated March 7, 1871.

It'will be observed that blocks -Band (l are placed at right `angles to blocks F and G, so that the joints are .not coincident. Each of these blocks is providedwith a spring, marked, respectively, b j' c g, which,by bearing against the inner walls of the case A, causes the packing to maintain close contact with the rod.

D, E, H, and I represent guide-blocks placed on each side of the packing-segments, overlapping their joints. Each of these is provided Vwith a spring, marked d, e, h, and t', respectively, which, by bearing against the interior of the caseA, cause them to bear iirmly against the segments andhold them inposition. Guideblocks D and H are provided, also, with fixed dowels m, which enter corresponding slots in the edge of the case A and the recess in the cylinder-head, into which it is placed.

It will be observed that the segmental pack-v same kind of metal as that used for thev sego ments, as they will never come in frictional contact with the piston-rod. c

Iam aware that quite avariety of segmentalmetallic packings actuated by springs have been proposed. I am not aware that anyhave heretofore been made in which the segments were so formed that while the wear was being continuously compensated Ait was impossible for them to come in contact and prevent proper relation with the piston-rod. Neither am I aware, prior to my invention, of the use of guide-blocks which serve to hold the several segments in piston-rod.

In segment-packings composed of semi-triangular blocks having Atheir points of contact with the rod at their inner ends to continuously compensate for their wear, broad spaces must be left between them; or, if narrower spaces be employed, the edges would soon come together and prevent proper contact with the rod.

proper relation to-the valve or Having thus described my invention, I claim as new and desire to secure by Letters Pat-4 ent- 1. The improvement in metallic packing for piston and other similar rods, consisting of the segments B and C, corresponding in form, having parallel sides, and of a width snfliciently less than the diameter of the rod with which they are to be used to prevent their contact Y While compensating for their continuons Wear, 

